In my live app, the admob component has stopped showing up. It was working fine for a few weeks then just ceased to display. I did not violate any of their policies (nothing in Policy Manager in AdMob). I posted on their help forum and a reply came back asking to check a whole bunch of things - admob stopped showing ads after working OK - Google AdMob Community
What I don’t understand is - if all of these things needed to be set up then why was it working fine for weeks?